The picture itself is briliant!As for wings, you just need to draw them 15 times and they gonna look perfectly.You made them single layer. In the show, there are two levels of feeather. Maybe addding another one could help?

As fpr tail, I think its the fault of those lines indicating hair. Try making less or them. Or making the taila bit wider.

All those are just prepositions, since you asked for it straight. I think this piece is really great even without aby chages, so no need to redraw everything